AI doesn't rank — it recommends
When someone asks ChatGPT "Who's the best chiropractor in Austin?" something fundamentally different happens compared to a Google search. Google shows you a list and lets you pick. ChatGPT picks for you.
It typically recommends 3 to 5 businesses by name, often with a brief explanation of why each one stands out. No ads, no sponsored results, no page 2. Just a short list of names that the AI believes are the best answers.
That changes everything about how you need to think about online visibility.
What we measured
We ran pre-registered studies across 41 U.S. cities, testing how ChatGPT, Perplexity, and Gemini respond to real patient questions. We used over 120 query templates covering different conditions, treatments, and ways people ask for recommendations.
Then we analyzed over 19,000 responses to identify the patterns — what do the businesses that get recommended have in common? And what separates them from the ones AI ignores?
The patterns we found
Website structure is the top signal
The single strongest predictor of whether a business gets recommended by AI is how its website is organized. Clear page titles, proper heading hierarchy, logical internal linking, and well-structured content. In our chiropractic study, this had a Cohen's d of 1.14 — a massive effect size.
AI reads your website like a researcher reads a paper. If the structure is clear, it can extract and cite your information. If it's messy, it moves on to a competitor.
Domain authority is nearly irrelevant
This surprised us too. Domain authority — the metric most SEO agencies charge you to improve — had virtually no relationship with AI recommendations. The correlation was essentially zero across both our chiropractic and physical therapy studies.
What this means: you can't buy your way into AI recommendations through link building alone. You have to earn them through content quality and structure.
Specialty pages matter enormously
Businesses with dedicated pages for each service or condition they handle were cited by AI at dramatically higher rates. In our chiropractic study, 82-89% of cited practices had condition-specific pages. Practices without them were nearly invisible.
Each AI platform picks different winners
Only about 8.7% of businesses were recommended across all three platforms we tested. ChatGPT, Perplexity, and Gemini each evaluate content differently and reach different conclusions. Optimizing for one doesn't guarantee visibility on the others.
What this means for your business
The businesses getting recommended by AI right now didn't do anything special to target AI. They just happen to have well-structured websites with clear, detailed information about what they do.
The opportunity is in doing this intentionally. Less than 2% of businesses we studied had the right setup. That means in most markets, the first business to deliberately optimize for AI search will have a significant and lasting advantage.
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